Well, sweetheart, one fifth of an hour is simply 12 minutes. So, if you're trying to figure out a fifth of an hour, just divide 60 minutes by 5 and you get your answer. It's as easy as stealing candy from a baby.
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Three hours and 12 minutes is 3.2 hours. 12 minutes is one fifth of an hour (60/12 = 5) and one fifth is 0.2.
One fifth plus one fifth is two fifths (2/5).
one fifth
one and one-fifth
No, the plural form for 'man hour', the amount of work that one person can do in one hour, is man hours.